richards



n0 Model.) a Sheath-Sheet 1.

D; RICHARDS. SEWING MACHINE.

No. 543,507. Patented July so, 1895.

(No Model.) 7 3 Sheets-Sheet 2.

D. RICHARDS.

SEWING MACHINE. I No. 543,507. Patented July 30, 1895.

D. RICHARDS.

SEWING MACHINE.

Patented July 30, 1895.

(No Model.)

WWJM

- UNITED STATES PATENT OFFIQE.

DAVID RICHARDS, OF LONDON, ENGLAND.

SEWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 543,507, dated July 30,1895.

Application filed April 3. 1893. Renewed February 25, 1895- Serial No.539,678- 7 (No model.)

To all whom it may concern:

Be it known that 1, DAVID RICHARDS, engineer, a subject of the'Qucen ofGreat Britain, and a resident of London, in the county of London,England, have invented certain new and useful Improvements inSewing-Machines, of which the following is a full and truespecification.

My invention relates to improvements in sewing-machines, and has for itsobject to afford a greater supply of thread to the spool or bobbin ofthe lock-stitch mechanism than can-be wound upon the ordinary bobbin;and in accordance therewith 'means are provided whereby a second reel ofcotton or thread is made use of for the supply of the underneath threador cotton, and which second reel itselfperforms the functions of ashuttle, in so far as it carries the under or looking thread through theloop formed in theupper thread, or alternatively a bobbin, ashereinafter described, may be employed capable of holding a sufficiencyof thread, the advantages to be derived from such a system being thatthe machine may run a much longer time without stopping for the purposeof replacing the empty spool or bobbin with a full one or of windingfresh cotton or thread upon the bobbin than has heretofore been possiblewith the ordinary shuttles of lock-stitch machines, upon the bobbins ofwhich only a very few yards can be wound; and, again, by this intion avery high speed may be obtained without fear of breaking the top thread,as friction thereupon is reduced to a minimum.

Now, in accordance with this invention I have a novel and simplearrangement of bobbin and lock-stitch mechanism, whereby the advantagesabove enumerated are obtained, and whereby additional advantagessueh aseconomy, less liability of accident, as well as a capability of workingat a greatly-increased speedare secured than are possible with thatclass of machines now known as tworeel sewing-machines.

In order that this my invention may be fully understood and readilycarried into effect, I will now proceed to describe the same withparticular reference to the accompanying drawings, in which similarletters of reference indicate like parts in all the figures.

Figure 1 shows in side elevation my improvements as applied to asewing-machine. Fig. 2 is a front sectional elevation of the samethrough line A B, Fig. 1. Fig. 3 is an inverted plan. Fig. 4 is adetailed view showing the sliding plate removed and the front pin turnedup for the removal of the reel. Fig. 5 is a detail view of the slidingsleeve or bush which carries the thread-reel; and Fig. 6 is an invertedplan-view of my improvements, portion of the cylinder being broken away.

In carrying out this invention I have, beneath the bed-plate of themachine, a revolving cylinder a, formed at its front or needleend with asuitably-shaped hook or looper a. This cylinder a is carried upon theshaft a:

' and revolves with same.

Centrally (andlongitudinally therewith) inside the cylinder (1 aforesaidI have a projecting pin or rod 1?. This pin or rod 19 extends from theback of the cylinder and terminates at or slightly within the front endof the cylinder. Supported in a suitable bearing d, formed at the frontend of and underneath the bed-plate e of the machine, I have a secondpin or rodf, which isin line with the pin or rod b and extends nearlythereto, a small space being left between the two ends .to allow of thepassage of the thread or loop after the lock-stitch is formed. These twopins or rods 17 f form the spool-race. Sliding upon the aforesaid pins bf or spool-race I have a sleeve or bush g, (shown separately in Fig. 5,and also seen in Figs. 1, 3, 4, and 6,) which carries a reel of cottonor thread h. This bush or reel-carriage g I form at one of its ends witha suitably-shaped head i, in the groove or against the shoulder of whichtakes the projecting finger k of its actuating arm or lever Z- worked bycam or cams or other suitable mechanism or gearing and from which thecotton-reel it receives a reciprocating motion upon the spoolrace I) f.Though not shown, suitable leaders and tensions may be applied for theunder thread if desired. The actuating-arm Z maybe given an oscillatingmotion as well as a reciprocating motion in order that the projectingfinger is may be kept well within the groove 1' on head of thereelcarriage, and backlash and consequent rattling thereby be prevented.

In Fig. 6, which is an inverted plan of my im provements as applied to asewing-machine, will be plainly seen the action of the reel-carriage gupon the guide-pins or spool-race hf. A portion of the cylinder a is inthis figure shown broken away for facility of illustration. Theactuating-arm Z is jointed at Z to the lever s, which is pivoted at s tothe underside of the bed-plate c. On the levers there is a projectingstud or roller Z (shown in dotted lines,) which travels in a cam-grooveformed upon the periphery of the drum 11/, fixed upon and revolving withthe shaft 00. At the commencement of the stroke the reel 72, uponcarriage g, is at the front end of the machine, as shownin full lines inthe drawings, the finger 7c of the actuating-arm Ztaking in the groove tof the head of the carriage g. Upon the descent of the needle thehook aof the revolving cylinder at takes the thread from the needle andspreads it around the cylinder, and a loop is thus formed through whichthe cotton reel and carriage may pass. As the drum u revolves, the studZ on levers travels in the camgroove upon the periphery of same anddraws the lever s, which is pivoted at s, as aforesaid, and with it thearm Z and reel-carriage g, to the position shown in dotted lines, thecottonreel and carriage passing through the loop of the upper thread andentering the cylinder a, as shown, the carriage g sliding off theguidepinfonto the guide-pin b. A suitable takeup (not shown) provided onthe head of the machine or in other convenient position draws thelock-stich upward between the ends of the pins I) f, and thus completesthe stitch at every stroke of the needle. lt he reel and carriage thenresume the positionshown in full lines and are ready for the nextdescent of the needle, when the operation is repeated.

The cylinder a, with hook or looper a, may have either, as abovedescribed and sl1own,a rotary motion, or an oscillating or reciprocatingmotion may be imparted to it, and when desired a suitable varyingmovement is applicable.

To take oil the reel 7L when empty and re place with a full one aconvenient method is to form the bed'plate e of the machine with asliding portion m (see Figs. 1 and 3) over the front end of thespool-race and to pivot the front pin f of the spool-race in itshearing, as at a. When the sliding portion in of the plate is withdrawnthe front pin f may be turned up and the reel or bobbin h can readily beremoved and another one substituted. Fig. 4 shows the sliding portion onof the bedplate 6 removed and the front pin f turned up for removalofthe reel h. The end of the pin f is let into the longitudinally-tiltingblock 0, which latter, pivoted at it, upon being depressed, as shown,raises the pinfand reel 71. through the opening caused by the removal ofthe sliding plate m and allows the reel 7t to be taken off.

The tilting-block 0 is formed with a projection or heel which extendsbeyond the end of the bed-plate, so that it may be readily reached andmanipulated. \Vhen this projection is depressed the inner end of theguide-pinf is swung longitudinally upward until itreaches asubstantially-vertical position.

1) is a spring fixed at top of the tiltingblock 0, which when inposition is pressed upon by the sliding plate m and tends to keep thefront guide-pin fof the spool-race true. (See also Fig. 1).

For convenience, where a reel at hand is too large to pass within thecylinder (L the carriage 9 may be formed (see particularly Fig. 5) witha removable head 0" at its free end, such free end being screw-threadedfor its reception. The cotton or thread may then be wound from the reelonto the carriage g, which will thus form a bobbin. Fixed to the sleeveor bush 9 I may have a spring q, as shown in Fig. 5, which when thesleeve or bush 9 is passed through the aperture in the cotton-reel willtend to hold same firmly in position.

These improvements are adapted for use or employment on either top orbottom feed machines and upon most of the machines now in use, and fromthe construction of the revolving cylinder at and its hook or looper ait may be placed immediately under the bed plate of the machine, therebyenabling a short needle to be employed-always a great advantage whenworking at high speed.

It will be observed from the foregoing that the shuttle now generallyused is entirely dispensed with, the hook or looper on end ofthe'cylinder spreading the thread and forming the loop and thecotton-reel being in its reciprocations passed through the loop whenformed. Hence a great saving in expense is obtained and friction ortension upon the top thread is reduced, the only strain upon same beingthe weight of a portion of the under or looking thread, and not, asheretofore, having to bear partly the weight of the shuttle or thecasing of the under reel, as is the casein the two-reel machines now inuse.

Having now particularly described my invention, what I claim, and desireto be secured to me by Letters Patent of the United States, xs

1. In a sewingmachine, the combination of the looping cylinder acarrying the guide pin 12, of a guide pin f, the laterally pivoted andVertically tilting block 0, swinging longitudinally of the spool race,by which the guide pin f is carried, said block when depressed beingadapted to elevate the inner end of the guide pin f into a substantiallyvertical posithe bed plate having a section thereof remov-- tion, andthe sliding sleeve g adapted to slide j a looping cylinder a carryingthe guide pin b,

of the guide pin f, the laterally pivoted and vertically tilting block0, swinging longitudinally of the spool race, by which the guide pin fis carried, the heel or projection connected to said block and extendingbeyond the end of the bed plate, so that when said heel or projection isdepressed the inner end of the guide pin f will be elevated into asubstantially vertical position, and thesliding sleeve g adapted toslide upon said guide pins when they are in line with each other,substantially as described.

3. In a sewing machine, the combination of able, of the looping cylindera carrying the guide pin 6, the laterally pivoted and vertically tiltingblock 0 swinging longitudinally of the guide pin b and carrying theguide pin f, the spring 1), secured to the upper surface of said blockand adapted to bear against the under side of the removable section ofthe bed plate when the guide pin f is in its lower position, and thesliding sleeve g adapted to slide upon said guide pins, substantially asdescribed.

4. In a sewing machine, the looping cylinder a carrying the guide pin1), the guide pin f pivotally mounted in line with said guide pin 1),the sleeve g formed with the groove 2' and adapted to slide upon saidguide pin, an actuating arm provided at one end with an angular fingeris engaging the groove upon said sleeve, a lever s pivoted at one end tothe bed plate and at its other end pivoted to said actuating arm, a studt formed upon said lever 8 intermediate of its ends, a drum u, situatedon the power transmitting shaft, a cam groove formed upon the peripheryof said drum and into which the said stud t projects so as to transmitreciprocating motion to the sleeve, substantially as described.

DAVID RICHARDS.

Witnesses:

A. G. ELI, GEO. COXHEAD.

